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o2 sensor

Duane53

Active Member
I have a question about the O2 sensors. Would a bad sensor kill the gas mileage? I have an 08 CVO Ultra and the gas mileage has gone south on me. I didn't have the check engine light come on although there is a code saying rear sensor lean. I just thought I would check and see what your thoughts were on this.
Thank You
Duane
 
Is your scoot stock or what if any mods have been done? I would think if the 02 sensor is bad your check engine light would come on as well as a code.
 
Great read Jack. This needs to be added to the self help section.
 
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